These fuse holders are supporters for fuses with size up to 22*58mm,They are capable of working under hear cased by rated current and expected short impacting current up to 100kA. It can also function as a fuse disconnecting switch by multi-phase combination. There are two in/out lines at the RT18N fuse base,providing a power cut function. The RT-18L type has a safety lock to lock the fuse carrier when disconnected to avoid wrong operation;it can also be equipped with an indicator,which goes on when the fuse links breaks.